"A henge is a prehistoric monument consisting of a circle of stone or wooden uprights, with Stonehenge in Wiltshire one of the best-known examples."

Works for me.

Got a link for that ?Why ignore the multiple examples of reputable definitions that differs from the that ?Why ignore the multiple examples of henges that do not have stone or timber circles ? Notice any difference between your definitions and that one ? i.e. “Henge = a large stone or wooden post set in astronomical alignment.“

C'mon EP... This not a triumph for you. Even though this article seems to corroborate your definition of henge, it corrects itself immediately in the next paragraph... Give it up. Holler calf rope. Concede.

What is a henge?

A henge is a prehistoric monument consisting of a circle of stone or wooden uprights, with Stonehenge in Wiltshire one of the best-known examples.

Conventionally, a henge comprises of a ditch with an external bank with one or more entranceways.

Cotton Henge is formed purely of two ditches which would originally have had associated external banks, it never contained any standing stones.

You came up with the answer to one question . And evaded the others .The single answer only highlighted the problem of omission , which seems to be catching .

As Circumspice points out , why did you omit "Conventionally, a henge comprises of a a ditch with an external bank with one or more entranceways." ?Did you also fail to see "Cotton Henge is formed purely of two ditches which would originally have had associated external banks, it never contained any standing stones." too ?

"A henge is a prehistoric monument consisting of a circle of stone or wooden uprights, with Stonehenge in Wiltshire one of the best-known examples." , is nearly correct ,all that is missing is the qualifier "sometimes" . As you have been told many times "Henges are sometimes associated with megaliths but only a very small percentage . " All the henges that do not have stone or timber circles prove the need for that qualifier .

One of your definitions “Henge = a large stone or wooden post set in astronomical alignment.“.Note, even by the bbc version , which is hardly ideal , no mention of astronomy ,and the timber or megaliths were in the plural , never mind unnecessary .Making your definition ,wrong . But we didn't need any more confirmation , we knew that anyway .